StG RBV-80 DATA SHEET. Air bleed valve. Features. Description. Application range. Fast, stable and precise control of compressor bleed air

Transcription

1 Air bleed valve DATA SHEET Description This is a servo assembly complete with valve which provides fast and precise bleeding of gas turbine compressor discharge air. This assists with: 1. Dry low emissions fuel systems 2. Improving part load compressor efficiency of single shaft 3. Increasing part load exhaust temperatures for combined cycle power generation systems 4. Improving power turbine over-speed limitation on multishaft In application the valve is usually connected between the gas turbine compressor discharge and the exhaust. The unit accepts a 4-20 ma process demand signal from the turbine governor and positions the butterfly valve in direct proportion to the demand. When the valve is closed, the servo system forces the butterfly against the valve seal thus providing positive shut off of the compressor discharge air thus maintaining compressor performance. Metso type LM valves are specified with temperature and pressure ratings to exceed the conditions pertaining at the discharge of modern high pressure ratio gas turbine compressors. To help with limitation of over-speed on load rejection on multi-shaft turbines, the unit is very responsive in operation. A multi-turn digital encoder provides precise drift free positioning of the valve. The unit is independently certified for use in hazardous areas to ATEX standards (CSA pending). Only 24 VDC nominal battery supply is required which makes application very convenient and safe compared to competitive high voltage systems. Features Fast, stable and precise control of compressor bleed air Independently certified for hazardous area application Works from safe low voltage power supply Specified for high temperature and pressure with low leakage Application range Í Gas turbines

2 Technical data Designation Actuator and gearbox Power supply voltage range 18 through 32 VDC Power supply current range < 1 A (steady state) through 10 A positioning Ambient temperature range -20 through +80 C Environmental rating IP56 Hazardous area certification Ex d Zone 1 (all gas groups) T6 ATEX (CSA pending) Position demand signal 4-20 ma equivalent 0 through 90 degrees Position achieved feedback signal 4-20 ma equivalent 0 through 90 degrees Motor drive type Four quadrant pulse width modulated Maximum torque at valve shaft 40 Nm Bandwidth 5 Hz Slew rate (10 through 90 % rotation) 300 ms Power 180 W Mounting Primarily through valve pipe connection and steady bracket Valve coupling Solid coupling with keyed actuator and valve shafts Gearbox Planetary 2 stage Gear ratio 20:1 Mechanical deadband 0.5 degrees Field electrical connections Screw terminals accessible through actuator unit end cover with 20 x 1.5 mm threaded gland entries Application Small frame Weight of assembly 21 kg Actuator end plate material Aluminium Actuator and gear casing and gear Steel material Valve Type Metso type LM triple eccentric butterfly Size 3 inch (80 mm) Process pressure rating 48 bar Process temperature rating 600 C Style Wafer Rotary valve span 0 through 90 degrees Leakage Body material Stainless Steel CF8M

3 Dimensions

4 Subject to alterations. Heinzmann UK Ltd., 2015 Heinzmann UK Heinzmann UK Ltd. Stanley House, Wallis Road Skippers Lane Industrial Estate Middlesbrough TS6 6JB United Kingdom Phone: Fax: Head Office Heinzmann GmbH & Co. KG Am Haselbach 1 D Schönau/Germany Phone: Fax: info@heinzmann.de ETM_DS_UKSTGRBV80_04_2015

5 Air bleed valve DATA SHEET Description This is a servo assembly complete with valve which provides fast and precise bleeding of gas turbine compressor discharge air. This assists with: 1. Dry low emissions fuel systems 2. Improving part load compressor efficiency of single shaft 3. Increasing part load exhaust temperatures for combined cycle power generation systems 4. Improving power turbine over-speed limitation on multishaft In application the valve is usually connected between the gas turbine compressor discharge and the exhaust. The unit accepts a 4-20 ma process demand signal from the turbine governor and positions the butterfly valve in direct proportion to the demand. When the valve is closed, the servo system forces the butterfly against the valve seal thus providing positive shut off of the compressor discharge air thus maintaining compressor performance. Metso type LM valves are specified with temperature and pressure ratings to exceed the conditions pertaining at the discharge of modern high pressure ratio gas turbine compressors. To help with limitation of over-speed on load rejection on multi-shaft turbines, the unit is very responsive in operation. A multi-turn digital encoder provides precise drift free positioning of the valve. The unit is independently certified for use in hazardous areas to ATEX standards (CSA pending). Only 24 VDC nominal battery supply is required which makes application very convenient and safe compared to competitive high voltage systems. Features Fast, stable and precise control of compressor bleed air Independently certified for hazardous area application Works from safe low voltage power supply Specified for high temperature and pressure with low leakage Application range Í Gas turbines